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Calculate the molarity of a solution made by dissolving 0.0715 mol Na2SO4 in enough water to form 550 mL of solution.
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15 grams of NaCl is dissolved completely in a beaker containing 200mL of water. What is the Na+ concentration in moles/liter in the final solution?
Consider two acids HCN and HNO2: HNO2 + H2O NO2- + H3O+ Ka = 5.1 x 10-4 HCN + H2O CN- + H3O+ Ka = 2.1 x 10-9 Which of the following statements is/are true? A ...
How many moles of magnesium ion are present in 5.25g Mg 3 (PO 4 ) 2 ?
A hydrogen atom emits a photon as its electron changes from n = 5 to n = 2. For the H atom, E n = -2.18E-18*(1/n 2 ) J. What is the wavelength (in m) of the photon? ( ) m The number of significant digits is set to 3; t ...
A solution is made by mixing 30.0ml of 0.240M NH3(aq) with 30.0ml of 0.240 M hydrochloric acid. What is (Are) the principal species and their molarities in the resulting solution? What is the PH of the solution?
There are five forces identified by porter their relevance will be necessary for evaluating companies identified in the pharmaceutical and tobacco industry in the Middle East. CAD Pharmaceuticals Middle East pharmaceutic ...
What wavelength of light (nm) is required to eject an electron with a speed of 2.0 x 10 6 m/s from a metal with a threshold energy of 3.4 x 10 -18 J?
Vinegar is an aqueous solution of acetic acid CH3OOH. A10 mL sample of a particular vinegar requires 31.45 mL of 0.2560 Mof KOH for its titration. What is the molarity of acetic acid in vinegar?
How is vacuum filtration completing the purification of your sample? Where are the impurities at this point? For a recrystallization lab in organic chemistry
Explain why the mass of the crucible and anhydrous salt is less than the mass of the crucible and the hydrate. What is the chemical formula of copper (II) sulfate?
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Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate
Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p
Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As
Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int
Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As